[GitHub] [iceberg] hililiwei commented on a diff in pull request #6382: Implement ShuffleOperator to collect data statistics

["hililiwei (via GitHub)" <gi...@apache.org>]

hililiwei commented on code in PR #6382:
URL: https://github.com/apache/iceberg/pull/6382#discussion_r1124200310


##########
flink/v1.16/flink/src/main/java/org/apache/iceberg/flink/sink/shuffle/DataStatisticsOperator.java:
##########
@@ -0,0 +1,134 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iceberg.flink.sink.shuffle;
+
+import org.apache.flink.api.common.state.ListState;
+import org.apache.flink.api.common.state.ListStateDescriptor;
+import org.apache.flink.api.common.typeinfo.TypeHint;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.runtime.operators.coordination.OperatorEvent;
+import org.apache.flink.runtime.operators.coordination.OperatorEventGateway;
+import org.apache.flink.runtime.operators.coordination.OperatorEventHandler;
+import org.apache.flink.runtime.state.StateInitializationContext;
+import org.apache.flink.runtime.state.StateSnapshotContext;
+import org.apache.flink.streaming.api.operators.AbstractStreamOperator;
+import org.apache.flink.streaming.api.operators.OneInputStreamOperator;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatistics;
+import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatisticsFactory;
+import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting;
+
+/**
+ * DataStatisticsOperator can help to improve data clustering based on the key.
+ *
+ * <p>DataStatisticsOperator collects traffic distribution statistics. A custom partitioner shall be
+ * attached to the DataStatisticsOperator output. The custom partitioner leverages the statistics to
+ * shuffle record to improve data clustering while maintaining relative balanced traffic
+ * distribution to downstream subtasks.
+ */
+class DataStatisticsOperator<T, K> extends AbstractStreamOperator<DataStatisticsAndRecordWrapper<T, K>>
+    implements OneInputStreamOperator<T, DataStatisticsAndRecordWrapper<T, K>>, OperatorEventHandler {
+  private static final long serialVersionUID = 1L;
+
+  // keySelector will be used to generate key from data for collecting data statistics
+  private final KeySelector<T, K> keySelector;
+  private final OperatorEventGateway operatorEventGateway;

Review Comment:
   it doesn't seem to be in use.



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